wikiHow - Kelvin to Celcius is easy. It's the other two that it's worth having a trick to remember. http://www.wikihow.com/Convert-Between-Fahrenheit%2C-Celsius%2C-and-Kelvin | Facebook
6 Ways to Convert Between Fahrenheit, Celsius, and Kelvin
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6 Ways to Convert Between Fahrenheit, Celsius, and Kelvin
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